
public class Example4_4 {
   public static void main(String args[]) {
     Point p1,p2;
     p1 = new Point();
     p2 = new Point();
     System.out.println("p1的引用:"+p1);
     System.out.println("p2的引用:"+p2);
     p1.setXY(1111,2222);
     p2.setXY(-100,-200);
     System.out.println("p1的x,y坐标:"+p1.x+","+p1.y);
     System.out.println("p2的x,y坐标:"+p2.x+"."+p2.y);
     p1=p2;
     System.out.println("将p2的引用赋给p1后:");
     System.out.println("p1的引用:"+p1);
     System.out.println("p2的引用:"+p2);
     System.out.println("p1的x,y坐标:"+p1.x+","+p1.y);
     System.out.println("p2的x,y坐标:"+p2.x+","+p2.y);
   }
}
